To mitigate this issue, users should install Citrix Receiver LTSR 4.9 CU6 (4.9.6001) and any future updates to 4.9 that are released or the current version of Citrix Workspace. Versions of Receiver for Windows OTHER THAN 4.9 have already or will soon reach their end-of-life and will not be fixed by Citrix. Best software for design on mac. Citrix Discussions - Citrix Viewer Crashing in Mac OS X Lion (10.7) Citrix Discussions - Citrix Viewer 11.9.15 crashes on Mac OS X 10.10.3 when connecting Was this page helpful?
Check the Computer Name field. If it is blank, type a computer name for the machine so that a license can be assigned to it.

The session opens successfully from a MacBook using Citrix Receiver for Mac.
Problem Cause
Because the Mac devices does not have a registry like Windows devices, a license must be issued to the client devices name. If the device does not have a name, it cannot be issued a license. It attempts to assign a license to a null value, and the session drops.
Additional Resources
Citrix Viewer Mac Download
Citrix Discussions - Citrix Viewer Crashing in Mac OS X Lion (10.7)
Citrix Discussions - Citrix Viewer 11.9.15 crashes on Mac OS X 10.10.3 when connecting

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